Zhejiang Lierda Internet of Things technology Co. Ltd LSD4WN2L917M90 Benutzerhandbuch
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packet may change dynamically.
1)、Flow control mechanism
The user determines the length of a frame of data. When the serial port
exceeds the 2-byte transmission time does not receive the new serial data data
or reaches the FIFO storage limit, it is judged that one frame of data
transmission is completed.It immediately pull down the BUSY pin (busy) and
the serial port is received and the sending operation is performed. After the
transmission is complete (successful or failed), the BUSY pin is re-pulled high,
and if the WAKE pin is still high, re-enable the module's serial port reception.
2)、Physical subcontracting mechanism
The actual physical packetization is determined by Network Server, and the
user can query the response parameters via the AT command or request
detailed information to obtain the packet case.
In general, the maximum load value N corresponding to different rates is
shown in Table 3-2.
Table 3-2 The maximum load value corresponding to the different rates
SF
N（MAX）
7
222
8
222
9
115
10
51
11
51
12
51